[all-commits] [llvm/llvm-project] 984384: SelectionDAG: Do not propagate divergence through ...

[Matt Arsenault via All-commits]

  Branch: refs/heads/main
  Home:   https://github.com/llvm/llvm-project
  Commit: 9843843c88f6cd8fa68c301ba751c001c254cb63
      https://github.com/llvm/llvm-project/commit/9843843c88f6cd8fa68c301ba751c001c254cb63
  Author: Matt Arsenault <Matthew.Arsenault at amd.com>
  Date:   2024-07-31 (Wed, 31 Jul 2024)

  Changed paths:
    M llvm/lib/CodeGen/SelectionDAG/SelectionDAG.cpp
    M llvm/test/CodeGen/AMDGPU/dag-divergence.ll
    M llvm/test/CodeGen/AMDGPU/inline-asm.ll
    M llvm/test/CodeGen/AMDGPU/sdag-print-divergence.ll
    M llvm/test/tools/UpdateTestChecks/update_llc_test_checks/Inputs/amdgpu_isel.ll.expected

  Log Message:
  -----------
  SelectionDAG: Do not propagate divergence through copy glue (#101210)

This fixes DAG divergence mishandling inline asm.

This was considering the glue nodes for divergence, when the
divergence should only come from the individual CopyFromRegs
that are glued. As a result, having any VGPR CopyFromRegs would
taint any uniform SGPR copies as divergent, resulting in SGPR
copies to VGPR virtual registers later.



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